In this paper, we consider two ways to introduce a spatial
inhomogeneity into the structure.
One is to vary the area \(\mathcal {A}_n\)  of each junction \(n\) 
(assuming the island area to be already optimized to minimize
the ground capacitance as was done in
Refs. [1]}, [2]}, [3]}).
This leads to a simultaneous variation of the junction
inductances \(L_n\)  and capacitances \(C_n\) , such that their
product \(L_nC_n=\mathrm {const}\) . Optimizing over all areas
\(\lbrace \mathcal {A}_n\rbrace \) , we find that the best result is still
achieved for a homogeneous configuration.
<FIGURE>